Fix an issue when deleting the entire content of an unsubmitted inline comment
Summary: Ref T12733. In this case, the server returns no new row, but we would incorrectly try to bind to one.
- Created a new comment.
- Edited it.
- Deleted all the text.
- Saved changes.
- Before: Header continues to show phantom "1 Unsubmitted Comment", browser error log reflects one error.
- After: Header reflects comment being deleted, error log is quiet.
Reviewed By: chad
Maniphest Tasks: T12733
Differential Revision: https://secure.phabricator.com/D18262